Pressure-regulating device for the rollers of sugar-cane mills.



H. w. AITKEN. PRESSURE REGULATING DEVICE FOR THE ROLLERS 0F SUGAR CANE MILLS.

APPLICATION FILED OCT- ]0, 1914. 1,210,254.

' 3 SHEETS-SHE ET I. W W

' i M N Q 77225296896. EH 17106 7 "7 7. Zz z 761/: Zdmw Patented Dec. 26, 1916.

H. W. AITKEN. PRESSURE REGULATING DEVICE FOR THE ROLLERS 0F SUGAR CANE MILLS. APPLICATION FILED OCT- 10. 1914.

1,210,254. Patented Dec. 26,1916.

3 SHEETS-SHEET 2.

Wfimsses Z H. W. AITKEN.

PRESSURE REGULATlNG DEVICE FOR THE ROLLERS 0F SUGAR CANE MILLS.

' APPLICATION FILED on. 10. m4.

1,210,254. Patented Dec. 26,1916.

3 8HEETSSHEET 3.

Wz zessas 9 1L lwzverzr HUGH WALLACE AITKEN, or GLASGOW, SCOTLAND.

PRESSURE-REGULATING DEVICE FOR THE ROLLERS OF SUGAR-CANE MILLS.

Specification of Letters Patent.

Patented nee. 2c, 1916.

Application filed October 10, 1914. Serial No. 866,092.

To all whom it may concern:

Be it known that I, HUGH VVALLAOE Arman, a subject of the King of'Great Britain and Ireland, residing at Richmond Chambers, 147 Bath street, Glasgow, Scotland, have inventedcerta-in new and useful Improvements in Pressurerltegulating Devices for the Rollers of Sugar-Cane Mills; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters or figures of reference marked thereon, which form a part of this specification.

This invention relates to pressure-regulating devices for the rollers of sugar cane mills.

t is common practice to employ hydraulic cylinders for controlling the pressure on the bearingsof the top roller or one or both of the side rollers of sugar cane mills, these cylinders being placed within the headstock caps which hold in the bearingsof the hydraulically-controlled roller. It is usualto employ U or cup leathers for packing the rams of these hydraulic cylinders; and much objectionable delay is frequently caused by these leathers giving way and requiring the stopping of the mill for several hours while the necessaryoperations are performed to allow a new leather to be inserted.

According to the present invention which will be described in the following specification and more particularly defined in the annexed claims-d so arrange the hydraulic cylinder, ram andpacking as to prevent, or greatly reduce, the objectionable delays above mentioned, and at the. same time provide a convenient and advanta- 'geou's construction and arrangement of cylinder and ram. I prefer to employ compressible packing retained and compressed by a screwed-in (or otherwise adjustable) gland; and I provide for the adjustment of the gland (totighten the packing) without withdrawingthe cylinder or its cover, or the ram, or moving the headstock cap.

The carrying -;of my invention into efiiect is illustrated "by the accompanying drawings.

Figure l and each of the Figs. 311 is a vertical section through the top headstock cap and hydraulic cylinder of a sugar cane mill, these several figures showing dilierent forms which may be employed. F ig- Qis, as regards its left-hand portion, a section on the line A B of Fig. l and, as regards the bayonet joint attachment already well known may be employed, 2'. 6., the cylinder may be provided with two or more lugs (Z,

and the hole in the cap. furnished with a corresponding number of inward projections 0. The cylinder, after being introduced by an axialmovement into thehole in thecap, is given a fractional turn so as tobring, the lugs (Z under the projections e. The lower end of'the cylinder is, internally threaded at f to receive a gland g which is externally threaded and screwed into the cylinder so as to compress packing it within ,a stuillng box provided in the cylinder. 7c is a metal ring provided between the end of I the gland and the packing so that the rotation of the gland in screwing up .does not tend to rotate the packing. The lower end of the gland is formed with an external flange m provided with grooves 01, which const uction enables the gland to be gripped and rotated by a wrench or spanner. A hole 0 is formed right through the headstock cap from side to side (i. 6., parallel to the axis of the roller) and the cap is further cut away at .3) so as to allow room for manipulating the gland without moving the headstock cap or cylinder. to is the pressure fluid connection to the hydraulic cylinder. 8 is a bolster piece placed between the bearing j and the ram 1. This bolster piece is adapted to slide between, and be guided by, the aws t, t of the cap.

Fig. .3 shows a construction and arrangement of .pressure-regulating device in general the same as that illustratedin Figs.

1 and 2, but with a slightly diiferent dethat the gland is screwed to the ram instead of the cylinder, the ram being threaded at 3 to engage with an internal thread on the gland.

Fig. 6 shows an arrangement generally the same as that shown in Fig. 5, except that the bolster piece slides between the two sides ofthe headstock a instead of between the jaws of the cap.

In the arrangement shown in Fig. 7, the gland is screwed to a nipple a which is inserted inthe cap below the hydraulic cyl: inder. 53

Fig. 8 shows an arrangement with a U leather 2 in addition to compressible packing h. The gland is screwed to the ram, the packing 71. located in a recess in the ram, and the U leather located in anindependent recess in the ram. The packing 72, can be compressed without exerting pressure on the U leather. With this arrangement the U leather may be normally relied on to prevent leakage; but, when the leather fails, the gland 9 may be screwed up so as to compress the packing h, and dependence placed wholly on the packing 72 to prevent leakage. The leather can be renewed at any convenient time by withdrawing the hydraulic cylinder, removing the ram therefrom and unfastening from the latter the removable top or cover piece 3 which holds in the leather.

In the constructions hereinbefore described, the cylinder has been formed separately from the cap and inserted into the cap in an axial direction from the top or outside of the cap. The cylinder may, however, be formed integrally with the cap, that is, a recess may be bored out of the cap to form the cylinder. A liner may, or may not, be provided in this recess,

Fig. 9 shows an arrangement in which the cylinder is bored out of the cap, and a liner 4 provided. The cylinder and liner are shown with closed upper or outer ends, the ram being inserted within the cylinder before the cap is placed on the headstock.

Fig. 10 shows an arrangement in which the cylinder is bored out of the cap, but the upper or outer end of the cylinder is closed and kept tight by means of a gate or cover 5 and a cup leather 6. The gland might be screwed to the headstock cap instead of to the ram.

Fig. 11 shows an arrangement generally the same as that shown in Fig. 10, except that the cap is closed in below the opening 0 to act as a guide for the ram,

The gate or cover 5 shown in Figs. 10 and 11 may either be slid into place in a direction perpendicular to the axis of the cylinder, or a bayonet joint device employed of the same general nature as that illustrated in Figs. 1 and 2 of the present specification for securing the cylinder within the cap.

All the figures illustrate the application of my invention to the top roller bearings of a sugar cane mill, but the invention is equally applicable to the bearings of one or both of the side rollers and, moreover, without any substantial alterations in construction. 7

It will be seen that in all the foregoing embodiments of my invention, provision is made for the removal or adjustment of the packing without withdrawing or dismantling the cylinder or ram or removing the headstock cap, since the operative portion of the gland ml, which is the portion to which the spanner or other suitable imple ment is adapted to be applied, is in every instance at all times located in proximity to the opening 0 so as to be easily accessible and readily manipulated whenever desired. So far as I am aware,. I am the first in the art to employ a construction of this character in a sugar cane mill and my claims to these features are therefore to be interpreted according to the scope given to inventions of this character.

In the hereinb'efore description the gland has been described and illustrated as screwthreaded and, except in one case (Fig. 7), directly secured by said screw-thread to the cylinder or ram. This construction has the advantage that the gland takes up the minimum of space; but the gland could be otherwise secured to the cylinder or ram, say, for example, by studs and nuts, or bolts and nuts, in the well known manner commonly employed for the glands of stuihng boxes and the like.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is 1. In a sugar cane mill, a headstock cap having an opening through its side wall, a ram packing within the headstock cap, and a gland to adjust the ram packing and acccssible through said opening for adjustment.

2. In a sugar cane mill, a headstock cap, a ram packing within said headstock cap, and a gland for said ram packing, said headstock cap having a lateral cut away portion for rendering said gland accessible for adjustmen't.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

HUGH WVALLAOE AITKEN.

\Witnesses:

I JOHN GEORGE STEVENSON,

GEORGE TAYLOR.

Copies of this patent may be obtained. for live cents each, by addressing the Commissioner of Patents,

Washington, D. G. V v 

